用于对细小的孔洞的填充，是预处理的一种.再生产过程中，往往导致局部的材料中出现孔洞，这种孔洞严重影响了材料的性质。所以需要进行处理-This is a part of PreProcessing Work.Used for filling small holes.In　reproduction process, partial material　often have small holes.such holes has seriously affected the nature of the material. Therefore necessary to deal with.